Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivern » passiveern, massivern, passivenern, passiven, passiver, passivieren
passivere » passiveere, massivere, passivenere, passiverer, passiver
massiven » massive, passiven, massively

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((passiv OR (massiven OR passivern)) OR passivere).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiven or passivern)) or passivere)*.